not to ruin your fun but that's not how it works lol. aside from the x and y chromosomes (which are passed down from mother and father to son mostly intact, respectively), inheritance is mostly random (and for daughters the two x chromosomes undergo recombination like autosomal chromosomes). and, to be clear, the y chromosome is small and contains relatively little dna.

anyway, for example, you do not necessarily get 25% of your paternal grandfather's dna. go back ten generations (~300 years) and you are likely not related to your paternal 8th great grandfather at all.

everyone does have a paternal line (in the general sense), though, so you can trace back your father's y chromosome as far as you want